There is a lot of commonly used words on BB, and some rare ones that are not used so much in the outside world.
I have noticed that there are also some erudite blitzers, so this is the thread for them. And for the others, a chance to expand their vocabulary.
Rules for this thread:
i) nominate a rarely used word (one per day) WITHOUT recourse to a dictionary/thesaurus/internet.
ii) give a post a like if you have not heard that word before (or at least not in the last X years).
My rarely used word for today: